(1848: 6-196)*48, 3030-75*33+445, 273*(1336-1173)-809*25, 12020+(120*104-137780: 166)

(1848:6-196)*48=(308-196)*48=112*48=5 376
3030-75*33+445=3030-2475+445=5505+445=5 950
273*(1336-1173)-809*25=273*163-809*25=44 499-20 225 = 24 274
12020+(120*104-137780:166)=12 020+(12480-830)=12 020+11 650 =23 670